Winnebago Industries Inc. said today that earnings fell 14.4 percent in its third fiscal quarter as higher materials and labor costs on newly introduced vehicles hurt its profit margins, the Associated Press reported.

The company’s share price fell more than 4 percent in premarket trading.

Winnebago earned $11.3 million, or 35 cents a share, in the three months ended May 26 versus $13.2 million, or 40 cents a share, a year ago.

Sales rose 5.2 percent to $231.7 million from $220.3 million a year ago.

Analysts polled by Thomson Financial expected income of 49 cents a share on sales of $245.5 million.

The company said customers have been buying lower-margin motor homes in recent months. It also incurred higher expenses from moving its Dealer Days event to the third quarter from the fourth quarter and for bonuses to executives.

For the first nine months of the fiscal year, Winnebago earned $26.7 million, or 84 cents a share, down from $35.4 million, or $1.08 per share, a year earlier.

Nine-month sales fell to $632.5 million from $659 million a year earlier.